<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
div {float:left; margin:10px;}
#div1 {width:50px; height:50px; background:red;}
#div2 {width:250px; height:180px; background:#CCC; display:none;}
</style>
<script>
window.onload=function ()
{
	var oDiv1=document.getElementById('div1');
	var oDiv2=document.getElementById('div2');
	var timer=null;
	
	oDiv1.onmouseover=function ()
	{
		clearTimeout(timer);
		oDiv2.style.display='block';
	};
	oDiv1.onmouseout=function ()
	{
		timer=setTimeout(function (){
			oDiv2.style.display='none';
		}, 500);
	};
	
	oDiv2.onmouseover=function ()
	{
		clearTimeout(timer);
	};
	oDiv2.onmouseout=function ()
	{
		timer=setTimeout(function (){
			oDiv2.style.display='none';
		}, 500);
	};
};
</script>
</head>

<body>
<div id="div1"></div>
<div id="div2"></div>
</body>
</html>
